Technologies can be classified according to:-methods, techniques and equipment used;-way data is structured and organized for processing, data entry procedures in the computer;-processing methods and techniques and rendering the results . Viewpoint of technical and functional performance that, after the response time of informatics systems technologies can differentiate into: delayed response, technology, real-time technologies. After the mode data structure and organization of automatic data acquisition technologies are classified as: technologies that use file-classical-classical technology that uses files and / or files embedded-technologies that uses databases. After the location in relation to the electronic computer to generate data points and features to exploit information obtained from processing:- technologies for centralized systems, distributed computing systems-technologies Estimated resource requirements determined ELEM machines for each configuration are internal
1.Memory – estimating memory requirements is based on computing the relationship: M = M1 + M2 where N = total memory requirements, memory M1 = requires operating system chosen for folklore, M2 = requires memory for Application program execution. Memory requirements for software application is: M2 = max (Ma, Mb, .., Mn)
2.Estimating peripheral equipment needs of central processing equipment is made according to the input-output units and external memory. Peripherals required number is determined in relation to factors: input-output-stream;-volume data that is required to be stored in external memory;-mode operation;-No programs to run in parallel.
3. Estimating staff of specialized personnel – necessary specialist staff establishment and operation of computer system, are determined in relation to:-volume work called the complexity and volume of work required for maintenance and operation of computer system.
4.Estimating product requirements, the program can be provided:-the set of computer programs that accompany electronic-printed by taking the elements;-by download other programs from other computer centers;-by developing software with their own efforts . Timetable information system. This stage is based on the principle of designing and implementing staggered. Phasing is the order in which components will be addressed. Phasing is the form of a detailed chart that specify how each component, and during each stage of implementation. Criteria: the priority objectives of component-b-linking components. These relationships are of two types of previous relationships and successful relationship, c-availability of resources
